http://www.musikding.de/Drehknoepfe  Germany/EU/ WW ?

http://www.maplin.co.uk/fluted-knobs-1819  Niederlande / UK

http://www.banzaimusic.com/Plastic-Metal/  Germany – günstig und gut

 

 

KnobsSupplierPart Number
Standard MOTM style knobMouser506-PKES90B1/4
Small MOTM style knobMouser506-PKES60B1/4
Large Alco knock-offBridechamber 
Large BOSS style black knob with silver topMammoth Electronics4SKLGFLBK
Small BOSS style black knob with silver topMammoth Electronics4SKSMFLBK
Large heptagon knobs, pack of 4Radioshack274-416
Small heptagon knobs, pack of 4Radioshack274-415
Small flatted knob (for rotary switches)Mouser5164-1510AH